Doctor profile · Federal record
Dr. Thomas Klarquist, M.D.
Internal Medicine Physician (CMS: Internal Medicine) · Chicago, IL
- NPI 1477517373
- Accepts Medicare
- 39 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
3134 N Clark St
Chicago, IL 606574414
(773) 296-5090
fax (312) 766-4908 - Additional location
-
1695 N Sunrise Way
Palm Springs, CA 922623701
(760) 323-2118 - Mailing address
-
29373 Network Pl
Chicago, IL 606731293
Credentials & registration
- NPI registered
- April 2006 — 20 yrs on file
- Profile last updated
- March 26, 2025
- Year of graduation
- 1987 — 39 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Illinois #036100647
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1477517373. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
792
Distinct HCPCS
10
Medicare allowed
$67,846
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 222 | 121 | $131 | |
36415 |
Insertion of needle into vein for collection of blood sample | 177 | 121 | $8 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 111 | 111 | $131 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 69 | 56 | $95 | |
G0008 |
Administration of influenza virus vaccine | 41 | 41 | $32 | |
G0009 |
Administration of pneumococcal vaccine | 41 | 41 | $32 | |
90662 |
Influenza vaccine split virus, preservative free | 39 | 39 | $72 | |
90677 |
Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use | 35 | 35 | $282 | |
83036 |
Hemoglobin a1c level | 26 | 17 | $10 | |
99211 |
Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional | 18 | 15 | $24 |
In context: peer comparison
Among 487 peers in Chicago Internal Medicine Physician, average services per provider: 168. This provider delivers 4.7× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
1,591
Patients
390
Total drug cost
$899,654
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 307 | 84 | $5,084 |
| Lisinopril | Generic | 228 | 63 | $2,292 |
| Amlodipine Besylate | Generic | 134 | 39 | $1,922 |
| Metformin Hcl | Generic | 92 | 25 | $972 |
| Hydrochlorothiazide | Generic | 86 | 27 | $868 |
| Tamsulosin Hcl | Generic | 82 | 20 | $1,617 |
| Losartan Potassium | Generic | 81 | 25 | $1,622 |
| Levothyroxine Sodium | Generic | 78 | 23 | $1,427 |
| Dovato (Dolutegravir Sodium/Lamivudine) | Brand | 77 | 0 | $267,858 |
| Metoprolol Succinate | Generic | 76 | 23 | $2,354 |
Frequently asked questions
What is Dr. Thomas Klarquist's medical specialty?
Dr. Thomas Klarquist practices Internal Medicine Physician in Chicago, IL.
Where does Dr. Thomas Klarquist practice?
Dr. Thomas Klarquist practices at 3134 N Clark St, Chicago, IL 606574414. Office phone: 7732965090.
What is Dr. Thomas Klarquist's NPI?
Dr. Thomas Klarquist's National Provider Identifier (NPI) is 1477517373, issued by NPPES.
Does Dr. Thomas Klarquist accept Medicare assignment?
Yes. Dr. Thomas Klarquist accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Thomas Klarquist commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Insertion of needle into vein for collection of blood sample (HCPCS 36415); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439). Source: CMS Medicare Physician & Other Practitioners file.